One-way valve
a one-way valve and valve body technology, applied in the field of one-way valves, can solve the problems of affecting the sealing capacity of the valve, and still forming a considerable part of the total cost of the packag
Inactive Publication Date: 2006-04-13
MIKVAK AB
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- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
[0007] The inventive one-way valve thus employs an aperture formed in the package material, said aperture being surmounted by an adhesive sheet. The adhesive sheet usually comprises a carrier and an adhesive. The carrier could be made from e.g. plastics or paper and the adhesive could be a glue, the adhesiveness of which diminishes when the glue is exposed to increasing heat. In addition, the adhesive sheet is arranged to uncover the aperture when exposed to pressure loads. One of the advantages gained by this solution is its simplicity and above all the fact that the package itself may be used as part of the valve. The only addition is an adhesive sheet. The adhesive sheet may be opened and closed repeatedly. The valve in accordance with the present invention thus may be used in the course of cooking and packaging of the foodstuff but also during the final re-heating thereof, following which the food is to be removed from the package in order to be served, for instance.
[0016] In order to keep the contents as free as possible of toxic and other contaminating substances, the adhesive in direct contact with the slit suitably should be of a kind that is accepted for use in conjunction with foodstuff. The adhesive on the flap for example preferably is of this kind. However, the risk that any matter enters into the package via the slit is minimal.
Problems solved by technology
When the above described valves of conventional type are used, the oil is blown off by the water vapour, in many cases resulting in considerable impairment of the sealing capacity of the valve.
Another problem is the costs.
Although these valves are comparatively simple structurally, they still constitute a considerable part of the total costs of the package.
Method used
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[0026] The package 1 shown in FIG. 1 comprises a bottom part 2, a top part 3 formed with a tongue 4, and a tape 5 formed with a flap 6. The tongue 4 is delimited by a V-shaped slit and the flap 6 is arcuate. The bottom part 2 may be made from the same material as the top part 3 or from another stiffer material suitable for use in microwave ovens. The top part 3 is made from a non-directional laminated material in order to prevent the slit that forms the tongue 4 from continuing in the form of a rip in the top part 3. The tape 5 is formed with a flap 6 the aperture of which extends in the same direction as the aperture of tongue 4 in the top part 3.
[0027] The packaging of the food thus starts by the food 7 being placed on the bottom part 2 of the package 1 as shown in FIG. 2a. The top part 3 is placed on the bottom part 2 (FIG. 2b), said top part 3 having a tongue formed therein and comprising a tape 5 formed with a flap 6. FIG. 2c illustrates how the food 7 inside the package 1 is ...
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A one-way valve, intended particularly for use in food packages The valve, which is intended to be fitted on a package, is arranged to open in response to an excess pressure inside and is recloseable. An adhesive sheet is arranged on top of an aperture formed in the packaging material. The adhesive sheet being arranged to uncover the aperture when exposed to pressure loads.
Description
TECHNICAL FIELD OF INVENTION [0001] The present invention relates to a one-way valve particularly intended for food packages, said valve designed to be fitted on a package and arranged to open in response to excess pressure inside said package. The one-way valve is recloseable. TECHNICAL BACKGROUND OF INVENTION [0002] One-way valves of the kind defined in the introduction are previously known. The Fres-co System from the Goglio Group and the Wicovalve® from Wipf are examples of valves of this kind that comprise a button-shaped cylindrical membrane retainer and a membrane. The membrane is the active part of this type of valves and it opens or closes the valve depending on the pressure relationship between the two sides of the membrane. The membrane is oiled to ensure that the valve is sealed. [0003] This type of valve is used for coffee packages and packages intended for certain foods. In order to increase the shelf-life of these foods it is important that they be vacuum-packed, i.e....
Claims
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IPC IPC(8): F16K37/00B65D33/01B65D81/34B65D77/22B65D81/26
CPCB65D77/225B65D81/3453B65D2205/00Y10T137/7891Y10T137/8326
Inventor HAAMER, JOEL
Owner MIKVAK AB